土壤养分对春小麦苗期水分状况的影响

本文初步研究了半干旱农田以肥凋水的水分生理机制．在土壤含水量为１３％－１５％的条件下，氮肥和磷肥均可改善春小麦苗期叶片的水分状况．从而起到提高水分利用率的作用．实验表明磷肥的作用效率大于氮肥．说明磷肥可能是半干旱地区决定作物水分利用率的关键因素．

Effects of Soil Nutrients on Water conditions of Spring Wheat-Seeding

Fertilizing nitrogen, phosphor and nitrogen phosphor were useful for water conditions of spring wheat under 13%-15% soil water content during early growth.All the three could increase relative water content, water poten tialand water holding capacity. thus water use efficiency could be raised. At research spot phosphor and nitrogent phosphor fertilizers had higher effects than nitrogen had, so phosphor might be the key factor of limiting water use.It is imPOrtant to use phosphor fertilizer in semiarid fields.